I can't be bothered to pull apart your argument in detail, you are confusing military success against politics. And refering to videos of helioopters going over carrier decks compared to actual military facts from the war.
Do yourself a favour and read the history of the Tet Offensive.
Comments about Syria,Iraq and Afghanistan are just ridiculous. Assad has 70% popular? What a joke, it's dropped then from the 97% he had from the last election. LOL
Or maybe the drop is due to the ove 2m which have been forced out of the country.
If you think US should stay out of other countries business then look where that isolationist view got the world in the 1930's
If the US had stuck to isolationism view which you seem to cheer then Aus could very well still be part of the Japanese Empire today.
And all of Europe could of ended up occupied by the Soviets.
Easy to make judgement sitting from the comfort and safety of a free country like Aus.